Telephone.



No. 764,139. PATBNTED JULY 5, 1904. J. W. MEAD, H. A.IMAGK1E & M. VANBUREN.

TELEPHONE.

APrLIoATIoN FILED 0013.19` ma.

N0 MGDBL.

E mmullllg citizens of the United States, residing at Am- UNITED STATESPatented July 5, 1904.

PATENT OEEICE.

JOHN W. MEAD, HARRY A. MACKIE, AND MARTIN VAN BUREN, OF AMSTERDAM, NEXVYORK, ASSIGNORS TO SAID VAN BUREN AND JOHN J. TURNER, OF AMSTERDAM, NEVYORK.

TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 764,139, dated July 5,1904.

Application filed October 19, 1903.

To all whom t may concern.-

Be it known that we, JOI-IN W. MEAD, HARRY A. MACKIE, and MARTIN VANBUREN,

sterdam, in the county of Montgomery and State of New York, haveinvented new and useful Improvements in Telephones, of which thefollowing is a specification.

This invention relates to that class of telephones or telephone systemsin which an induction-coil is employed in the subscriberssignaling-circuit instead of a manual generator.

The object of our invention is to provide a comparatively simpletelephone system of this character which insures the sending of a promptand lreliable signal from the substation to the central ofiice.

A further object is to provide a telephone which can be used with theold system and which at the same time affords the advantage ofautomatically calling up the central oiiice by the act of removing thereceiver from the movable hook or support, as in the centralenergysystem.

The accompanying drawing is a diagrammatic view of the subscribersoutiit of a telephone system containing our invention.

A indicates the rcceiverfwhich is normally supported by the usualpivoted hook or switchlever B.

O is the transmitter, D the subscribers callbell, and E the battery orsource of electrical energy at the subscriber-s station.

F F are binding-posts forming the terminals of the main line.

g is a contact-spring which is in constant electrical connection withthe receiver-hook and which is connected by awire g' with one of themain-line binding-posts-say the post F.

L is a wire connecting one side of the callbell coils with thebinding-post F', and L is a wire connecting the other side of said coilswith the main-line post F.

I is the usual induction-coil included in the subscriberstalkingcircuit. One bindingpost of the transmitter C is connected withone end of the primary of the coil I bya wire Serial No. 177,539. (Nomodel.)

z', while its other binding-post is connected with one pole or' thebattery E by a wire i. The opposite end of the primary of the coil I isconnected by a wire 2 with a switch-contact j. j" is a similarswitch-contact arranged opposite the contact y' and connected with theother pole of the battery E by a wire f2. The .two contacts j j arearranged opposite a nose f3 on the rear arm of the hook B and adapted tobe connected by the latter in the elevated position of the hook, asshown by dotted lines in the drawing.

One end of the secondary of the coil I is connected by a wire /c withthe switch-contact j', while its other end is connected by a wire 7c'with one of the binding-posts of the receiver A. The other binding-postof the latter is connected by a wire Zwith the mainline binding-post F.

When the parts are in the normal condition (shown by full lines in thedrawing) and the subscriber is called by the central ofiice, the currententering, for example, through the main-line binding-post f passesthrough the wire Ii, subscriber-s call-bell D, and wire 7i to the othermain-line post, F. thus ringing said bell. Upon removing the receiver toanswer the call the hook B is elevated by the contact-spring g orequivalent means to the position shown by dotted lines in the drawing,thereby connecting the switch-springs j" j' and closing thetalking-circuit. The current now flows from the main-line post F,through the wire g', contact-spring g, hook B, contact-spring j', thesecondary of the talkingcoil I, wire G, the receiver A, and wire Z, tothe other main-line post, F. At the same time the transmitter-circuit iscut in in an obvious and well-known manner.

The central-oice ringing-circuit and accessories and the talking-circuitand accessories above described may be-of any ordinary construction.They form no part of our invention and are shown, by way of example, inconnection with our improved automatic signaling mechanism or appliance.This mechanism is constructed as follows: m m indicate a pair ofopposing switch contacts or springs which are normally separated andadapted to be temporarily connected by a contact m2, carried by thereceiver-hook B, in such manner that when the hook is allowed to rise bythe removal of the receiver its contact m2 rides over both of thesprings m fm, but clears the same by the time that the hook reaches theupper end of its stroke and also in the depressed positionof the hook.For this purpose the free upper ends of these springs are V-shaped toform a narrow throat between them, and the contact m2 is provided at itslower end with a head or enlargement of greater width than said throat,so that the head spreads the springs, and thereby temporarily connectsthe same during both the upward and downward movements of the hook B.

N is an induction-coil, hereinafter termed the subscriberssignaling-coil, having one end of its primary connected with thecontactspring m by a wire o and having the other end thereof connectedwith one pole of the battery E by a wire o'. The other contactspring,m', is connected by a wire o2 with the opposite pole of the battery. Asuitable automatic vibrator or make-and-break device p is arranged inthe circuit of the primary for obtaining a strong induced current whichreliably operates the usual ring-off drop or illuminates the ring-offlamp at the central oiiice, these signal devices being well-known andnot shown in the drawing. One end of the secondary of the subscriberssignalingcoil is connected by a wire g with the mainline post F, whileits other end is connected by a wire g with a contact-spring q2, whichbears constantly against the receiver-hook B.

It will now be understood that upon removing the receiver from the hookthe latter rises, as before described, causing its contact m2 to brushover the switch-contacts fmy m and temporarily closing the subscriberssignaling-circuit. When this occurs, the current passes from one side ofthe battery E, through the wire 02, contact-spring' m, hook-contact m2,contact-spring m, wire 0, vibrator p, the primary of the subscriberssignaling-coil N, and wire o', to the other side of the battery. Theimpulses thus produced in the secondary of the coil N cause theoperation of the usual ring-off drop or the illumination of the ringofflamp at the central ofice. When the subscriber replaces the receiver,the hook B is depressed to its normal position, causing its headedcontact m2 to again connect the switchcontacts m m temporarily andautomatically notifying the central office of the fact that theconversation is finished. The central office is by this means called upinstantly and automatically in the act of removing the receiver and alsonotified automatically when the conversation is iinished by the act ofreplacing the receiver, thereby dispensing with the manual generatorrequired in the telephones employed in the old system and yet permittingthe use of that system. y

Our improvement thus provides the advantage of the automatic callafforded by the central-energy telephone system without incurring thelarge installation expense of that system and the comparativelyexpensive item of skilled labor required for its maintenance.

We claim as our inventionl. In a telephone, the combination with atalking-circuit, a receiver, and a movable support for the receiver, ofa subscribers signaling-circuit containing a switch, one member of whichis carried by the receiver-support whereby said circuit is controlled bythe movements of said support, an inductioncoil independent of thetalking-circuit having its primary included in said signaling-circuitand its secondary connected with the main line, and an automaticmake-and-break device independent of said switch arranged in the primarycircuit of said coil, substantially as set forth.

2. In a telephone system, the combination with the main-line terminals,a talking-circuit and a movable support for the receiver, of asubscribers signaling circuit containing a switch, one member of whichis carried by the receiver-support, whereby the signaling-circuit iscontrolled by the movements of said support, an induction-coilindependent of the talking-circuit having its primary included in saidsignaling-circuit, an automatic make-andbreak device independent of saidswitch ar ranged in the primary circuit of said coil, and metallicconductors connecting opposite ends of the secondary of saidsignaling-coil with said main-line terminals, substantially as setforth.

3. In a telephone system, the combination with the main-line terminals,a talking-circuit and a movable support for the receiver, of a IOOsubscribers signaling-circuit containing a' switch, one member of whichis carried by the receiver-support, whereby the signalingcircuit iscontrolled by the movements of said support, an induction-coilindependent of the talking-circuit having its primary included in saidsignaling-circuit, an automatic make-andbreak device independent of saidswitch arranged in the primary circuit of said coil, contacts engagingthe receiver-support, a metallic conductor connecting one end of thesecondary of said signaling-coil with one of the main-line terminals, asecond metallic conductor connecting the opposite end of said secondarywith one of said contacts, and a third conductor connecting the other ofsaid contacts with the other terminalof the main line, substantially asset forth.

4. In a telephone system, the combination with the main-line terminals,a talking-circuit containing an induction-coil and a movable switch-hookfor supporting the receiver, of a signaling-circuit containing a batteryand a IIO ductors connecting the ends of the secondaryl of thetalking-coil with the main-line terminals, substantially as set forth.

5. In a telephone system, the combination with the main-line terminalsand a talking-circuit containing an induction-coil, of a pivotedswitch-hook for supporting the receiver provided on opposite sides ofits pivot With switch-contacts, a signaling-circuit containing a batteryand a pair of contacts arranged to be connected by one of saidhook-contacts when the receiver is removed from the hook,

a signaling-coil independent of said talkingcoil having its primaryincluded in the signaling-circuit, a second pair of contacts bearingconstantly against lthe switch-hook, one end of the secondary of thesignaling-coil being connected With one of the last-named contacts, ametallic conductor connecting the other of said contacts With one of themainline terminals, a second metallic conductor connecting the other endof said secondary with the other main-line terminal, and a third pair ofswitch-contacts included in the talking-circuit and arranged to beconnected by the other contact of the switch-hook when the receiver isremoved from the hook, substantially as set forth.

Witness our hands this 14th day of October,

JOHN W. MEAD. HARRY A. MACKIE. MARTIN VAN BUREN. Witnesses:

FLORENCE E. PEARsoN, JOHN F. DWYER.

